From 070a94600855d895e3aef97a0acfbf4d8fca26e8 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 10 Dec 2019 21:28:20 -0700 Subject: [PATCH] i2c: designware: Add Apollo Lake support For Apollo Lake we need to take the I2C bus controller out of reset before using this. Add this functionality to the driver. Signed-off-by: Simon Glass Reviewed-by: Heiko Schocher Reviewed-by: Bin Meng --- drivers/i2c/designware_i2c_pci.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/i2c/designware_i2c_pci.c b/drivers/i2c/designware_i2c_pci.c index bb1f809..7f0625d 100644 --- a/drivers/i2c/designware_i2c_pci.c +++ b/drivers/i2c/designware_i2c_pci.c @@ -8,8 +8,14 @@ #include #include #include +#include #include "designware_i2c.h" +enum { + VANILLA = 0, /* standard I2C with no tweaks */ + INTEL_APL, /* Apollo Lake I2C */ +}; + /* BayTrail HCNT/LCNT/SDA hold time */ static struct dw_scl_sda_cfg byt_config = { .ss_hcnt = 0x200, @@ -19,6 +25,9 @@ static struct dw_scl_sda_cfg byt_config = { .sda_hold = 0x6, }; +/* Have a weak function for now - possibly should be a new uclass */ +__weak void lpss_reset_release(void *regs); + static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev) { struct dw_i2c *priv = dev_get_priv(dev); @@ -59,6 +68,15 @@ static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev) static int designware_i2c_pci_probe(struct udevice *dev) { + struct dw_i2c *priv = dev_get_priv(dev); + + if (dev_get_driver_data(dev) == INTEL_APL) { + /* Ensure controller is in D0 state */ + lpss_set_power_state(dev, STATE_D0); + + lpss_reset_release(priv->regs); + } + return designware_i2c_probe(dev); } @@ -88,6 +106,7 @@ static int designware_i2c_pci_bind(struct udevice *dev) static const struct udevice_id designware_i2c_pci_ids[] = { { .compatible = "snps,designware-i2c-pci" }, + { .compatible = "intel,apl-i2c", .data = INTEL_APL }, { } }; @@ -113,6 +132,12 @@ static struct pci_device_id designware_pci_supported[] = { { PCI_VDEVICE(INTEL, 0x0f45) }, { PCI_VDEVICE(INTEL, 0x0f46) }, { PCI_VDEVICE(INTEL, 0x0f47) }, + { PCI_VDEVICE(INTEL, 0x5aac), .driver_data = INTEL_APL }, + { PCI_VDEVICE(INTEL, 0x5aae), .driver_data = INTEL_APL }, + { PCI_VDEVICE(INTEL, 0x5ab0), .driver_data = INTEL_APL }, + { PCI_VDEVICE(INTEL, 0x5ab2), .driver_data = INTEL_APL }, + { PCI_VDEVICE(INTEL, 0x5ab4), .driver_data = INTEL_APL }, + { PCI_VDEVICE(INTEL, 0x5ab6), .driver_data = INTEL_APL }, {}, }; -- 2.7.4